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Never seen it. However, in office dipsticks are notorious for giving false positives. I've been seeing this for years most recently with false + methadone. I never act on a +UDS screen until I have confirmatory by GC/MS.

I like the recent comments. Been doing this since 2003 if that seems possible. Nothing compares to seeing pts regain their lives, families, jobs, and health. Certainly some do not; but how many of your uncontrolled diabetics' severe peripheral neuropathy and retinopathy goes away with lowering the A...